https://bugs.freedesktop.org/show_bug.cgi?id=47955
--- Comment #19 from Marek Olšák maraeo@gmail.com 2012-04-04 14:01:00 PDT --- I know. The vertex shader point size output is broken on SWTCL chipsets (piglit/glsl-vs-point-size fails randomly). I haven't been able to find the cause yet.